export interface MemoryCard {
  id: string            // 唯一标识
  createTime: number    // 时间戳
  participants: {
    self: { id: string; avatar?: string }
    other?: { id: string; avatar?: string }
  }
  location?: { geohash: string; name?: string }
  weather?: { icon: string; temp?: number }
  template: string
  memo?: string
} 